Matte neon pink lipstick is one of those things that sounds absolutely terrifying—until someone does it right. This week, that person was Camilla Belle, whose hot magenta lips at the Jimmy Choo party made me stop everything I was doing and call her makeup artist for details.

When makeup artist Fiona Stiles saw Belle's gray dress, she immediately thought hot pink. "Pink and gray has been my favorite combination since the Duran Duran days," she says. To keep the color from going on too thick, she applied __M.A.C. lipstick in Flat Out Fabulous__with a stiff, rounded lip brush. "You want to dab on matte lipsticks with a lip brush and not straight from the bullet, otherwise you'll get too much coverage right away," says Stiles, who slipped a brush and a sample of the lipstick into Belle's clutch for touch-ups. Another important move? Using blush—and not pink blush—on the apples of the cheeks to warm up the rest of the face. "Pink on pink can go baby-doll superfast. A tawny nude is better," says Stiles, who chose Benefit Blush in Rockateur for Belle.

What did you think of Belle's look? Do you have a favorite matte pink lipstick?